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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Representational State Transfer (REST) is an architectural style that guides the design and development of processes to interact with resources on the web. An API that complies with most or all of its guiding constraints is considered to be a RESTful API for a more comprehensive guideline refer here.
When writing code for the web, there are numerous Browser APIs available, which are typically used with JavaScript. The Browser has APIs available such as Geolocation API or, in my opinion, one of the most commonly used ones, the Fetch API.